Side sleeping

As

Is anyone having issues with baby preferring to sleep on their side? I lay my daughter on her back drowsy and she immediately turns to her left side and passes out. It makes me nervous so I try to roll her flat on her back but she wakes up and rolls onto her side again. I read once they are rolling it’s okay but she’s not rolling back to tummy or tummy to back daily, just every few days. But when sleeping she’s only rolling onto her side anyway. She’s not sleeping on her tummy.